Crossword Genius

Be successful with a superior suit (5)

Ross

I believe the answer is:

trump

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'suit' is the definition.
(I know that trump is a type of suit)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for trump that I've seen before include "club perhaps" , "Outplay" , "Card of designated top suit" , "Surpass" , "Powerful card - the last one to be heard at the Day of Judgement" .)

I've seen this clue in The Globe and Mail.
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